Self and howard finger



Unimet) 1 STATES PATENT OFFICE.

THOMAS F. VAN KEUREN, OF SAUGERTIES, NEW YORK, ASSIGNOR TO HIM- SELF AND HOWARD FINGER, OF SAME. PLACE.

cRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 252,299, dated January 10, 1862.

4 Application led November 9,1881. (Model.)

t, To all 'whom it may concern: i

Be it known thatI, THOMAS F. VAN KEU- REN, a citizen of the United States, residing at Saugerties', in the county of Ulster and State 5 of New York, have invented certain new and useful Improvements iu Grate-Bars, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to ventilating interro locking grate-bars.

Figurel is a plan view, partly in section, of a grate composed ot' these improved interlock'- ing vent-ilating grate-bars. Fig. 2 is a side view ot' the socket side of one of these gratebars. r The grate-bar A is provided on one side with end and intermediate` lugs, c, which may-be square, round, or oval in cross-section, and on the opposite sides with sockets b, into which zo the lugs of the next adjacent grate-bar lit. Shoulders c are formed around the lugs a and rims d around the sockets b. The lugs et are tapered outward, and the sockets b tapered iuward, and when the bars are placcdtogether the former tit into the latter, and the shoulders c and rims d abut against each other. The tapering ot' the lugs and sockets facilitates the insertion of the bars and admits of the eXpansion and contraction of the lugs. y

The lugs a are provided with holes c, whch form, with the sockets, a continuous'ventilating-tube through te grate from side to side.

The sockets b are provided with groovcsff, which permit the passage of air on the outside of the lugs. When the grate bars are placed together, the lugs being shorter than the sockets, there is a space between the ends of the lugs and the ends of the sockets, and the venti latin g-grooves f fcommunicate with this space, .to and thence with the central openings through the lugs.

rlhe last two bars B B ot' the series may be made without the projecting lug, to facilitate the placing of the same in position.

By means of the interlocking lugs and sockets the grate-bars are locked together, so that an even grate-surface is secured, and spaces being left between the upper and lower edges of the grate bars and the meeting shoulders and rims of the lugs and sockets, there are free passages for air from end to end of the grate-bars. These passa ges, in connection with the transverse passages through and around the lugs, afford ample circulation of air. and prevent melting of the grate-bars.

What is claimed as the invention is- 1. A grate-bar constructed with a lug on one side having a ventilating-passage and with a socket on the opposite side adapted to receive a corresponding lug of another grate-har, the

sides of the socket having ventilating-grooves which communicate with the ventilatiug-passage of the lug, substantially as described.A

2. A grate bar provided with tubular ventilating-lugs and with sockets having ventilating-passages, the lugs and sockets being tapered and adapted to interlock respectively with the Ventilating lugs and sockets of acor-` responding grate-bar, substantially as described.

3. A grate-bar constructed with lugs a, having shoulders c and Ventilating-passages e, and with, sockets b, rims cl, and ventilatinggrooves f, substantially as described.

In testimony whereof I aftix my signature in presence ot' two witnesses.

THOMAS F. VAN KEUKEN.

Witnesses:

HOWARD FINGER., JOHN C. DAVIS. 

